Is cob a good insulator?
Cob provides some measure of insulation from the elements, but it is not a superior insulator on the scale of straw bales, for example. And yet, homes made from cob walls can provide their inhabitants with very comfortable living environments, all year round. The way they do this is by being excellent storage units of thermal mass, by absorbing heat — from renewable heat sources like the sun, and from non-renewable heat sources like furnaces — and reflecting them back into the living rooms of the house.
